Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Suche nach dunkler Materie III

T 52.9: Talk

Wednesday, March 21, 2018, 18:40–18:55, Philo-HS5

Improving the radiopurity of CaWO₄ crystals for the CRESST experiment — •A. Kinast¹, A. Erb^1,2, T. Faestermann¹, G. Korschinek¹, A. Langenkämper¹, E. Lindner¹, A. Münster¹, E. Mondragon¹, T. Ortmann¹, S. Pavetich³, W. Potzel¹, S. Schönert¹, H. H. Trinh Thi¹, S. Wawoczny¹, A. Wallner³, and M. Willers¹ — ¹Physik-Department, Technische Universität München, D-85748 Garching — ²Walther-Meißner-Institut für Tieftemperaturforschung, D-85748 Garching — ³Department of Nuclear Physics, Australian National University, Canberra, Australia

The direct dark matter search experiment CRESST uses scintillating CaWO₄ single crystals as targets for possible recoils of dark matter particles. For several years these CaWO₄ crystals are produced directly at TUM including the CaWO₄ powder production from the raw materials CaCO₃ and WO₃ as well as the crystal growth via the Czochralski method. To further increase the sensitivity of the CRESST experiment, an improvement of the crystal radiopurity is crucial. To achieve this goal, a new method for the chemical purification of the raw materials has been developed at TUM. In order to investigate the radiopurity-level achieved by this method, highly-sensitive screening methods are required. In this work Accelerator Mass Spectrometry (AMS) has been tested for CaWO₄ radiopurity screening and first results will be presented. This research was supported by the DFG cluster of excellence “Origin and Structure of the Universe”, by the BMBF Verbundprojekt 05A2017 CRESST-XENON and by the SFB1258.